Mitsubishi L200. Manual - part 175

TROUBLESHOOTING

DIESEL FUEL

13A-496

• Damaged harness (Open circuit between 1st and 

2nd rail switch and engine-ECU, and open circuit 
between 1st and 2nd rail switch and J/B)

• Damaged connector (Engine-ECU connector, 1st 

and 2nd rail switch connector)

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 72: 1st and 2nd rail switch

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 2 .

STEP 2. Check 1st and 2nd rail switch itself

• Check 1st and 2nd rail switch itself (Refer to 

GROUP 22B 

− Transmission − Transmission 

Inspection  <2WD>, GROUP 22C 

− Transmission 

− Transmission Inspection  <4WD>).

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace the 1st and 2nd rail switch.

STEP 3. Connector check: B-06 1st and 2nd rail 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace.

STEP 4. Perform voltage measurement at B-06 
1st and 2nd rail switch connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON 

• Voltage between terminal No. 1 and earth.

OK: System voltage 

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Check intermediate connector C-30, and 
repair if necessary. If intermediate 
connector is normal, check and repair 
harness between B-06 (terminal No. 1) 1st 
and 2nd rail switch connector and C-208 
(terminal No. 2) J/B connector.

AK503584

1 2

Harness side 
connector

B-06 (GR)

Connector: B-06

AB

AK503584

1 2

Harness side 
connector

B-06 (GR)

Connector: B-06

AB

TROUBLESHOOTING

DIESEL FUEL

13A-497

STEP 5. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace.

STEP 6. Perform voltage measurement at C-105 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON 

• Voltage between terminal No. 11 and earth.

OK:

System voltage (Shift lever position: 1st)
0 V (Shift lever position: Neutral)

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Check intermediate connectors A-115 and 
C-29, and repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between C-105 (terminal No. 11) 
engine-ECU connector and B-06 (terminal 
No. 2) 1st and 2nd rail switch connector.

STEP 7. Check the trouble symptoms.

Q: Does trouble symptom persist?

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AKA00089

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

TROUBLESHOOTING

DIESEL FUEL

13A-498

YES : 

Replace the engine-ECU. When the engine-

ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ). After 
registering the injector identification code, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunction ).

TROUBLESHOOTING

DIESEL FUEL

13A-499

Inspection Procedure 19: Back-up Lamp Switch System <M/T>

OPERATION

• A backup lamp switch detects that a transmission 

is shifted into a reverse gear position.

• An engine-ECU controls an engine speed to be 3, 

000 r/min or less so that an excessive load can-
not be applied to a drive train system due to a 
sudden start in a reverse gear position.

PROBABLE CAUSES

• Failed back-up lamp switch

AKB00290

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1 2

Ignition switch (IG1)

9

13

L-B

L-Y

L-Y

R-G

R-G

R-G

Back-up Lamp Switch Circuit

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Grey
R: Red  P: Pink  V: Violet  PU: Purple  SI: Silver

Engine-ECU

Back-up lamp switch

21

7.5A

2

J/B

C-208

C-207

4

C-30

10

2

C-29

1

A-28

9

OFF

ON

C-105

B-02

MU802601

AB